Lifting and supporting device



N v- 8, 1967 J. B. GORMLEY LIFTING AND SUPPORTING DEVICE 5 Sheets-Sheet 1 Filed Sept. 15, 1965 Nov. 28; 1967 J. B. GOR MLEY LIFTING AND SUPPORTING DEVICE ATTORNEYS.

Nov. 28, 1967 J. B GORMLEY 3,355,147

LIFTING AND SUPPORTING DEVICE Filed Sept. 13, 1965 3 Sheets-Sheet 5 79 I f 25 76 v 1 p in 75 I1 I l \l.// 76 I I 20 I @y ENTOR.

ATTORNEYS.

United States Patent 3,355,147 LIFTING AND SUPPORTING DEVICE John B; Gormley, 60- McClellan Circle, Bulfalo,N.Y. 14220 Filed Sept. 13, 1-965, Ser. N0'.- 486,970 16 Claims. (Cl. 254-93) ABSTRACT OF THE DISCLOSURE This invention relates to improvements in lifting and supporting devices or jacks of the type shown in my Patent Number 3,222,451, for the purpose of facilitating the operation of the same, so that a single check valve is employed for passing fluid under pressure to a lifting cylinder, holding it there and also discharging the fluid. This apparatus is more easily actuated by an operator.

In the accompanying drawings:

FIG. 1 is an elevation of a supporting and elevating device embodying this invention.

FIG. 2 is a central, sectional elevation, onan enlarged scale, of the lower part of the device.

FIG. 3 is a central, sectional elevation of the intermediate part of the device.

FIG. 4 is a similar sectional elevation of the upper part of the device.

FIG. 5 is a transverse, horizontal sectional view thereof on line 5-5, FIG. 2.

FIG. 6 is a fragmentary, sectional elevation thereof on line 66, FIG. 2.

FIG. 7 is .a fragmentary View of the lower part of the foot-controlled mechanism of the device shown in FIG. 2'.

FIG. 8 is a fragmentary side view of the mechanism shown in FIG. 6.

FIG. 9 is a fragmentary sectional elevation on line 9-9, FIG. 8.

The lifting and supporting device shown in the accompanying drawings and constituting one embodiment of my invention includes a base which is formed to rest on the ground and which comprises two parts 8 and 9 suitably secured together and which contain the mechanism for raising and lowering the upper portion of the device. Secured to the upper part9 of the base is a tube or cylinder 10 within which a ram or piston 11 is telescopically arranged, that shown being also in a tube. The upper tube 11 terminates at its upper end in a pulley 12 over which a flexible cord or rope 14 operates and to the ends of which a manipulating rod 15 is secured. This part of the device forms the subject matter of my pending application No. 275,101, now Patent No. 3,222,451 andthat herein constitutes an alternative of that disclosed in said earlier application, but a load of. any other type may be supported by said tube 11.

The base comprising the lower and upper parts 8 and 9 is of bulb-shape and contains the mechanism for raising and lowering the tube or ram 11. This mechanism is actuated by a foot lever 17 which ispivoted on the part 9 of the base. The foot lever 17 is secured to a shaft 18 extending into the base and journalled in the upper part 9 and is suitably journalled in an enlarged inner portion 19 of the base. Since the raising and loweringmechanisrn is preferably actuated by fluid, such as oil contained in the base, a suitable packing, such as an O-ring 20 is provided on the base and extending about the shaft 18, so as to prevent the passage of fluid out of the base, and also prevent foreign matter from entering into the base.

The foot lever is suitably connected at one end thereof tothe shaft 18, for example, by providing the shaft with a noncircular end' portion 22 over which an end of the lever 17'fits and'on which it is held in place by means of a set screw 23. The outer end of the foot lever preferably has a lateral extension 25 which is formed integral with the outer end adapted for engagement by a foot of the operator. This extension of the lever enables the downward pressure of the foot to be approximately in the vertical, central plane of the device so that downward pressure on the part 25 on the lever will not tend to swing the device in either direction about its vertical axis.

The foot lever through the shaft 18, as will be hereinafter more fully explained, imparts vertical motion to a piston 27 arranged in a cylinder 28 which is mounted on the upper part 9 of the base. The cylinder is formed integral with a casing 30-of the device .and extends downwardly into the upper part of the base. This casing contains' a receiving chamber orspace 31 arranged above the cylinder 28 and an intermediate chamber 32 arranged above the'receiving chamber. The piston 27 has an O-ring 34 mounted in a groove to form a liquid-tight joint or piston ring with the cylinder 28. The two chambers 31 and 32 are separated by a valve 35 seated in the casing 30 and having a hollow stem 36 secured thereto. The valve 35 is provided with a plurality of openings 37 extending through the same, and the upper face of this valve is covered by means of a flexible valve member 38 which normally lies in contact with the upper face of the valve-member and closes the openings 37 therein. The stem 36 extends upwardly beyond the valve 35 and is provided at its upper end with a cap or head member 40 which has transverse openings 41 in communication with the interior of the stem or tube 36 which terminates in a cap 40 below the openings 41 therein. The head 40 is provided with a disk 42 which extends over the flexible valve 38 and limits the extent to which this valve can move upwardly above the valve member 35.

In the operation of the pumping mechanism thus far described, it will be noted that when the piston 27 moves upwardly, fluid contained in the cylinder 28 above the piston will pass upwardly through the tube or hollow stem 36 into the intermediate chamber 32 from which it passes upwardly into the tube 10 by raising a valve 45. This valve islocated in the-inner of two clamping members 46 and 47 which engage the lower, outwardly flaring end of the tube or cylinder 10. The outer clamping member 47 has an outwardly extending flange 49 at the lower end thereof which seats on an annular shoulder of the upper end of the base member 9, and .a gripping member 50 engages the upper face of the flange 49 and presses the same downwardly on the upper base member 9.

The gripping member 50 may be pressed downwardly toward the upper base member 9 in any suitable or desired manner and in the construction illustrated by way of example, a clamping ring 51 of well known construc: tion is provided for this purpose.

The inner face of the clamping member 47 is flared downwardly and outwardly to receive the correspondingly flared lower end of the tube or cylinder 10, and the inner clamping member 46 is similarly flared to-fit within the interior of the tube or cylinder 10. A tight clamping and gripping action of the tube between the clamping parts 46 and 48 may be obtained by a secure, fluid-tight gripping of the tube or cylinder 10 by clamping ring 51-. The inner clamping member 46 is hollow and has a seat for the valve 45 formed in the lower portion thereof. Consequently liquid under pressure passing upwardly from the intermediate chamber 32 will lift the valve 45 from its seat and flow up into the hollow clamping member '46 and into the tube or cylinder 10. The clamping member 46 is screwed down into liquid tight engagement with the top of the casing 30 by means of screw threaded connections including the screw threaded part 53 of the casing which is made with .an internal diameter sufficiently large to permit the valve 35 to pass through the same when the device is being assembled.

55 represents an O-ring arranged between the tube or hollow stem 36 to form a liquid-tight joint between this tube and the casing 30.

The upper tube or ram 11 is closed at its lower end to form a piston head and for this purpose in the construction shown, the lower end of the ram or tube 11 is contracted or flared inwardly, as shown at 57, FIG. 3. A cylinder head 58 is provided at the lower end of the tube or ram 11 and has an upwardly extending, integral sleeve 59, the interior of which is flared similarly to the lower end of the ram 11. By arranging the downwardly converging end of the tube or ram 11 within the sleeve 59 and by providing a clamping member 60 which is arranged within the lower end of the ram which has a downwardly tapering and converging part similar to the taper of the ram 11 and fits within the interior of the tapered lower end of the ram 11, and by drawing the clamping member 66 downwardly against the head 58, for example, by means of a screw 62, a secure connection between the lower end of the ram 11 and the head 58- is thus obtained, and the lower end of the ram 11 is sealed against entry of liquid into the ram. Relative motion and a wedging action between the clamping member 60 and the lower end of the tube 11 is obtained by having the lower end of the tube bear against the head 58, but liquid is permitted to pass between the head and the tube 10. The piston head 58 does not need to form a liquid-tight connection with the outer tube 10 for the reason that an O-ring 64 is provided surrounding this tube or ram and cooperating with the outer tube 11 through the medium of another gripping member 65 which cooperates with the outwardly flaring, upper end of the tube 10 in conjunction with another clamping member 66 and guides the ram tube 11 in its vertical movement while the O-ring forms a fluid-tight connection between the ram and the cylinder tube 10. The two parts of the clamping device shown in FIG. 3 are held in correct relation to each other by means of a clamping ring 67 similar in construction to the clamping ring 51 shown in FIG. 2. Consequently, when fluid pressure is forced into the tube or cylinder 10, the ram is moved upwardly to support the weight of the manipulating rod 19 and any load supported thereby. By means of this construction, the tube 11 need not fit snugly into the tube 1 since no liquid-tight joint is required between these tubes. This structure, consequently, permits the use of standard tubing, thus eliminating expensive machining.

The head 58 serves mainly to guide the tube 11 in the tube and does not fit tightly in the tube it so that fluid may enter the space between these two tubes where they overlap. In order that such fluid will not interfere with the free relative movement of the tubes, I provide grooves 63 in the periphery of the head 58 through which fluid may flow.

68 represents a vent valve which may be opened to discharge air which may have become entrapped in the outer tube 10 below the O-ring 64.

The ram or tube 11, together with the manipulating rod supported thereby, may be lowered by gravity by discharging liquid from the cylinder tube 10 and this can be done by moving the piston 27 by means of the foot lever 17 upwardly beyond its normal working stroke so that the cap 40 mounted on the tube or stem 36 moves upwardly in such a manner that a projecting part 70 on the upper end thereof engages the valve 45 and moves the same upwardly from its seat, thus permitting fluid from the tube 10 to enter into the intermediate chamber 32.

A spring 43 ensures the return of the cap 40, disk valve 37 and stem 36 to their lower position, thus ensuring the reseating of the disk valve.

Furthermore a movement of the piston above its working stroke will cause the hollow stem or tube 36 to move the disk valve 35 secured thereto, upwardly off of its seat so that liquid can readily flow into the receiving chamber 31 which is connected by means of a tube 71, thus discharging liquid into the part 8 of the base. This tube 71 also admits liquid into the receiving chamber 31 from which it passes during the intake stroke of the piston 27 into the cylinder 28 above the piston. This is due to the suction created and transmitted by the tube or stem 36 to the receiving chamber 31 and which causes the flexible valve 38 to lift from its seat to permit suction of liquid to pass into the intermediate chamber 32, from which it passes through the hollow stem or tube 36 into the cylinder 28.

From the construction described it follows that if it is desired to raise the ram 11 and the parts mounted thereon quickly, it is merely necessary to pull upwardly on the ram 11 whereupon the valve 45 will be lifted upwardly from its seat and the suction produced by lifting the same will also lift the flexible valve 38 and disk valve from their seats, thus drawing fluid into the receiving chamber 31 through pipe 71 and thence into tube 10.

The movement of the piston 27 by means of the foot lever 17 is preferably effected as follows: The shaft 18, which is secured to the foot lever 17, has a crank arm 75 secured on a non-circular part 76 of the shaft 18. The arm 75 is bifurcated at the outer end thereof and straddles a connecting rod 78. A pin '79 extends across the two arms of the bifurcated end of the crank arm 75 and through a slot in the connecting rod 78. The upper end of the connecting rod is connected by means of a crank pin 80 with the lower end of the piston 27. This end of the piston is preferably provided with an enlarged end 81 which is bifurcated and receives the connecting rod and crank pin 80 and supports on its upper end a flanged washer or spring support 83 on which the lower end of a spring 84 seats. The upper end of this spring bears on a shoulder 85 formed on the casing 30. This spring surrounds the cylinder 28 and exerts pressure downwardly on the washer 83 to urge the piston downwardly through its suction stroke. The spring 84 also urges the crank arm 75 downwardly, thus causing the foot lever 17 to swing upwardly into a position indicated at 17' to be again depressed by the operators foot.

When it is desired to lower the upper tube or ram 11, the foot lever 17 is pressed from its lower pumping stroke position shown in FIG. 2 to the lower position 17" which results in the movement of the piston 27 upwardly into a position in which the head 40 of the tube or stem 36 is raised to move the valve 45 oil of its seat. It will be noted that when the pedal is in its lowest pumping stroke position, as shown in full lines in FIG. 2, there is some further motion of the piston possible before the valve 45 is raised from its seat. This idle movement serves to notify the operator that the piston is in its upper position and further downwardly movement of the foot lever for a short distance results in no more pumping of fluid. Thus, the operator can tell when the foot lever reaches this lost motion position that the foot lever results in no more pumping so that he should release foot pressure on the foot lever and permit the spring 84 to force the same upwardly into the position 17 It will be noted that the working stroke of the piston by the foot lever 17 is in a substantially straight, vertical line, as shown by the positions of the crank pin 79 between the upper full line position and the lower broken line position. This results in eflicient operation of the pump with the minimum wear on the parts.

It is also desirable to move the foot lever into an upper position designated by 17, FIG. 2, so that this foot lever will be out of the way of the operator while using, moving or transporting the device. In order to accomplish this, it is necessary to provide means for limiting the downward movement of the piston 27 by the spring 84, and for this purpose, I provide stop rods 86 for the disk or spring support 83. These rods may be in the form of strips of metal having at their lower. ends enlargements 87. These stop rods extend through grooves or slots formed in the edge portions of the spring support 83', as shown in FIG. 6, and are secured at their upper ends to a fixed part of the mechanism, such for example, as the casing 30, providing recesses in the opposite sides of this casinginto which angular extensions or ends 88 of the upper ends of the stop rods 86 engage. When the spring support or. washer 83 is movedto its lowest position, the enlargements 87 will engage the spring support 83 to prevent further downward movement of the same. When the parts are in this position, further downward movementof the arm 75 of the foot lever is possible because of the slot 90 in the lower portion of the connecting rod 78. When the foot lever is raised into the uppermost position at 17", the pin 79 of the crank arm moves to the lower end of the slot 90 in the connecting rod and is yieldingly held in that position so that it can readily be moved to its working positions by slight pressure of the foot. In the particular construction shown for this purpose, I. provide a yieldingly arranged detent or spring pressed ball 95 which extends to a slight extent into the path of movement ofthe pin 79 and is yieldingly held in such position by a spring. This spring pressed ball holds the pin 79 in the slot 90 of the connecting rod below the ball 95,, thus holding the foot lever yieldingly in its uppermost position.

The two parts of the base may be secured together in any suitable manner, and in the construction shown these two parts are provided with outwardly extending flanges having interfitting edges connected in any suitable or usual manner, such as bolts extending through the flanges, orfor example, by means of compression or clamping ring 100. Rings of this type are indicated. at 100, 51, and 67. These are readily available and detailed explanations thereof are not believed necessary.

The pulley 12 may be mounted on the upper end of the upper tube or ram 11 in any desired'manner, for example, by means of the construction shown in my copending application Ser. No. 312,427, now Patent No. 3,222,031. In the construction herein shown the body portion of the pulley has a cylindrical, downwardly extending, cup-shaped part 111 which telescopes over and is secured to the upper end of the ram 11. Within the upper end of the ram 11, I' provide a split sleeve 101, the inner bore of which is tapered to converge upwardly, and a correspondingly sloped nut 102 is threaded to receive a bolt 104 with shoulder 106 resting on top of the cup-shaped part 111. Consequently, by tightening the bolt 104, the shoulder 106 bearing against the top of the cup-shaped part draws the nut 102 upwardly thus expanding the split sleeve 101 and locking the cup-shaped member on the top of the ram 11. The nut 102 preferably has splines (not shown) extending into grooves of the split sleeve 101 to hold the nut against turning relatively to the sleeve.

It is desired to enable the pulley 12 to turn freely about a vertical axis and for this purpose I provide a thrust washer 1'12 extending about the shoulder 106 of the bolt 104 having a part 107 of the lower end of the pulley housing resting upon it so that the pulley housing can turn freely about the bolt 104.

115' represents a screw plug which closes a hole in the upper part 9 of the base, through which oil or other lubricant may be passed into the base.

It will be understood that various changes in the details, materials'and arrangements of the parts which have been herein described and illustrated in order to explain the nature of the invention. may be made by those skilled in the art within the principle and scope of the invention as expressed in the appended claims.

ll claim:

1. A load. supporting device includinga base,

apair of telescopically arranged tubes, one of which is supported on said base and the other of which is slidably arranged to support a load and movable vertically relatively to said first tube and having liquid-tight connection therewith,

a casing of tubular form interposed between said base and a saidfi'rst' tube,

a check valve in' said casingfor controlling the admission' of fluid to the lower end of said first tube,

a hollow base into which said casing extends,

a cylinder on said casing,

a piston in said cylinder,

a disk valve which confines liquid to saidcasing,

means for reciprocating said piston to apply pressure to liquid for delivery to said casing,

and a bypass for. conducting liquid from said pump to said casing without moving said disk valve 2. A load-supporting device according to claim 1 in which said base ishollow and contains fluid,

and means for supplying fluid from said base to said cylinder.

3. A load supporting device according to claim 1 and including an extension on said piston which engages said check valve when said piston is moved beyond the end of its working stroke, and which. moves said check valve from its seat to permit fluid from said first tube to drain and to permit said second tube to descend.

4. A load supporting device including ahollow base,

a casing of tubular form mounted on the upper end of said base,

a cylinder forming a part of said casingand extending downwardly therefrom into said base,

a piston reciprocable in said cylinder,

a pair of telescopically arranged tubes, one of which is supported on said casing, and the other of which is slidable vertically relatively to said first tube,

a check valve associated with said first tube to retain fluid therein,

a receiving chamber in said casing above said cylinder,

an intermediate chamber in said casing above said receiving chamber and separated from said first tube by said check valve,

a passage connecting said base with said receiving chamber to transmit fluid from said base to said receiving chamber,

a disk valve connecting said chambers,

a hollow stem secured to said disk valve and extending into said cylinder into position to be raised by said piston when moved beyond its working stroke, and transmitting fluid under pressure from said cylinder to said intermediate chamber,

means for transmiting fluid from said intermediate chamber through said stem to said cylinder during the suction stroke of said piston,

valve means for admitting from said receiving chamber to said intermediate chamber during the suction stroke of said piston,

and means for simultaneously moving said check valve and said disk valve from their. seats to withdraw fluid from said first tube.

5. A device according to claim 4 and including a foot lever mounted on said base and connected with said piston for actuating the same.

6. A load supporting-device including a base,

a. pair of telescopically arranged tubes, one of which is mounted in fixed relation to said base andthe other isslidable within said first mentionedtube,

a cylinder and piston mounted in said base to discharge fluid stored in said base into saidfirstmentioned tube,

a check valve for holding fluid in said first mentioned tube,

a disk valve which also confinesfluid inv said first tube,

a hollow stem secured to said disk valve and through which fluid passes from said cylinder to said tubes,

and means for moving said piston beyond its compres- 7 sion stroke to engage said stem to unseat said check valve and said disk valve to permit fluid contained in said first tube to pass into said base.

7. A load supporting device including a base,

a pair of telescopically arranged tubes, one of which is mounted in fixed relation to said base and the other is slidable within said first mentioned tube,

a cylinder and piston mounted in said base to discharge fluid stored in said base into said first mentioned tube,

a check valve for holding fluid in said first mentioned tube,

a disk valve which also confines fluid in said first tube,

a hollow stem secured to said disk valve and through which fiuid passes from said cylinder to said tubes,

a pair of telescopically arranged tubes, one of which is mounted in fixed relation to said base and the other is slidable Within said first mentioned tube,

a cylinder and piston mounted in said base to discharge fluid stored in said base into said first mentioned tube,

a check valve for holding fluid in said first mentioned tube,

an intermediate chamber separated from said first tube a spring acting on said piston to move the same through its reverse stroke, said foot lever being swingable into upper and lower intermediate positions in which said pin engages the upper end of said slot, said foot lever being also movable into a position above said upper intermediate position in which said pin moves toward the lower end of said slot. 12. A load supporting device including a hollow base containing motive fluid for use in elevation and lowering means mounted on said base, said means including a cylinder and piston for delivering fluid under pressure to said load supporting device,

a foot lever pivoted on said base and having an arm and means for moving said piston beyond its compres- 5 arranged within said base,

sion stroke to engage said stem to unseat said check a connecting rod pivotally connected with said piston Valvfi and Said disk Valve to Permit fluid contained and having a slot extending lengthwise thereof and in said first tube to pass into said base, open at the lower end of said connecting rod,

said means including a foot lever movable in on a pin mounted on said arm and normally extending into direction to impart a compression stroke to said said slot to move said piston through its working piston, stroke,

and a spring acting on said piston for urging the same a spring acting on said piston to move the same through and said foot lever into reverse direction. its reverse stroke,

8. A device according to claim 7 and including yielding said foot lever being swingable into upper and lower means for limiting the movement of said foot lever to intermediate positions in which said pin engages the the compression stroke of said piston, upper end of said slot,

said foot lever being movable beyond said yielding said foot lever being also movable into a position above means to move said piston beyond its compression said upper intermediate position in which said pin stroke to unseat said valves. moves toward the lower open end of said slot,

9. A load supporting device including a base, and means for supporting said piston in its lower position while said pin moves downwardly in said slot. 13. A load supporting device including a hollow base containing motive fluid for use in elevation and lower means mounted on said base, said means including a cylinder and piston for delivering fluid under pressure to said load supporting device,

a foot lever pivoted on said base and having an arm arranged within said base, a connecting rod pivotally connected with said piston by said check valve, and and having a slot extending lengthwise thereof,

a hollow stern connecting said cylinder with said intera pin mounted on said arm and extending into said mediate chamber for supplying fluid from said cylslot to move said piston through its working stroke, inder to said intermediate chamber for passage said foot lever being swingable into an inoperative through Said check va1ve to id fi t b position above that in which said piston is moved and 10. A load supporting device including a base, in which said pin moves to the lower end of said a pair of telescopically arranged tubes, one of which slot,

is mounted in fixed relation to said base and the and resilient means cooperating with said pin for yieldother is slidable with said first mentioned tube, ingly holding said foot lever in said inoperative posia cylinder and piston mounted in said base to discharge tion.

fluid stored in said base into said first mentioned 14. A device according to claim 13 in which said resilient means for holding said foot lever in its inopertube, a check valve for holding fluid in said first mentioned atlvc position includes:

tube, a spring pressed dent on said connecting rod and exan intermediate chamber separated from said first tube tending into said slot and normally arranged below by said check valve, 5 said pin,

a hollow stern connecting said cylinder with said in- Said pi Wh n Said f ot lever is moved into said intermediate chamber for supplying fluid from said Operative Position moving downwardly in d Slot cylinder to said intermediate chamber for passage P Said dfiient and again o able upwardly in said through said check valve to said first tube, slot past said dent when said foot lever is moved and suction controlled means for supplying fluid to downwardly from its inoperative position.

said cylinder during the suction stroke of said piston. 11. A load supporting device including a hollow base in elevation and lowering 15. A load supporting device according to claim 12 in which said last mentioned means include:

a spring support connected with said piston and on containing motive fluid for use which the lower end of said spring rests;

meims mounteid on Said P sald. means mcludmg and stop rods secured at their upper ends on a fixed part 2:2 3: i i a gg gsi fluld under Pressur to of said device and having enlargements on their a foot le a piv ted on said base and having an arm lower ends which said Spring support when arranged Within said base, the piston has moved to ts lowest position to prevent a connecting rod pivotally connected with said piston further mOVtiIIleIlt f said piston.

and having a slot extending lengthwise thereof and load suplfortlng devlce lncllldlng base, open at the lower end of Said connecting rod, a pair of telescopically arranged tubes, one of which is a pin t d o id arm d ll t di mounted in fixed relation to said base and the other into said slot to move said piston through its workis slidable within said first mentioned tube, ing stroke, means in said base for transmitting fluid under pres- 9 10 sure from said base to the first of said tubes, said References Cited other tube fitting loosely in said first tube, UNITED STATES PATENTS means for closing the lower end of said other tube,

a head on the lower end of said Other tube and having 803,681 11/1905 Fahey 254 195 a close fit in said first tube and having passages for 5 l'453043 4/1923 Erhardt 60-52 fluid to flow into the space between said tubes, and 2434'949 1/1948 Mueller 60-52 a fluid-tight connection between said tubes at he up- 3222451 12/1965 Gormley 174 70 per end of said first tube. OTHELL M. SIMPSON, Primary Examiner. 

1. A LOAD SUPPORTING DEVICE INCLUDING A BASE, A PAIR OF TELESCOPICALLY ARRANGED TUBES, ONE OF WHICH IS SUPPORTED ON SAID BASE AND THE OTHER OF WHICH IS SLIDABLY ARRANGED TO SUPPORT A LOAD AND MOVABLE VERTICALLY RELATIVELY TO SAID FIRST TUBE AND HAVING LIQUID-TIGHT CONNECTION THEREWITH, A CASING OF TUBULAR FORM INTERPOSED BETWEEN SAID BASE AND A SAID FIRST TUBE, A CHECK VALVE IN SAID CASING FOR CONTROLLING THE ADMISSION OF FLUID TO THE LOWER END OF SAID FIRST TUBE, A HOLLOW BASE INTO WHICH SAID CASING EXTENDS, A CYLINDER ON SAID CASING, A PISTON IN SAID CYLINDER, A DISK VALVE WHICH CONFINES LIQUID TO SAID CASING, MEANS FOR RECIPROCATING SAID PISTON TO APPLY PRESSURE TO LIQUID FOR DELIVERY TO SAID CASING, AND A BYPASS FOR CONDUCTING LIQUID FROM SAID PUMP TO SAID CASING WITHOUT MOVING SAID DISK VALVE. 